MONTGOMERY, Ala. – A suspicious package that briefly shut down parts of Maxwell Air Force Base in Alabama contained only food.

Officials at the base in Montgomery said the package was found Friday during a routine inspection and initially tested positive for explosives. Security officials opened the package and realized it contained only food.

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All activities on the base have returned to normal.

The package was found at the base post office at about 10 a.m. It was about the size of a box of checks.

During the investigation, security officials cordoned off the surrounding area and closed a nearby entrance to the base.